Keysight 8990B Service Manual page 15

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Keysight 8990B Service Guide
Detach the U-wave attenuator pad
Detach the belt cover with the poron pad
Shield can bottom of the check source assembly
Check source board (08990-66004)
Uninstall the L-bracket from the rear mounting deck
135
Remove the seven screws
Remove the three screws
Remove the jumper
Detach the screws
Remove the CPU fan assembly
Remove the PC motherboard
Uninstall the power supply deck assembly
Uninstall the power supply deck assembly
Power supply deck assembly with the power supply mod-
ule and PC motherboard
Unscrew the screws and slot out the PSU
Remove the power cables connected to the power supply
module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Loosen the screws to remove the power cables
Remove the screws on the bracket
Uninstall the connectors and cables
Remove the heat spread
New thermal pads
Uninstall all the connectors
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